'Get Marked Frames' node is not showing up

I’ve found documentation for this node online but I can’t seem to call it even if I uncheck the ‘context sensitive’ option. I am using the newest version of Unreal Engine from Epic Games Launcher (4.26.0). I have enabled the ‘Sequencer Scripting’ add-on, restarted UE and I still can’t seem to call it even when using a new, blank project.

This is the node I am talking about:

I am not sure if this is a bug or if I’m doing something wrong.
Also I am trying to use this for my Level Sequence if that’s relevant at all.

The sequencer scripting plugin is an uncooked only module, so you can only use those functions in the blueprint of an editor utility widget: